Self-centering clamp for dynamic balance of transmission shaft assembly

Abstract

The utility model discloses a self-centering clamp for dynamic balance of a transmission shaft assembly, which relates to the technical field of clamp structures and comprises a base, a supporting component, a positioning component and a V-shaped positioning block are arranged on the upper surface of the base, and the supporting component comprises a sliding block and a guide rail slidably connected with the bottom surface of the sliding block. The positioning assembly comprises a fan-shaped elastic claw, the bottom face of the fan-shaped elastic claw is fixedly connected with a wedge-shaped block through a bolt, and the outer wall of the wedge-shaped block is slidably connected with a chuck base. Through cooperative work of the fan-shaped elastic claw, the wedge-shaped block, the chuck base and the centering spring in the positioning assembly, the automatic centering function of the transmission shaft is achieved. When the fan-shaped elastic claw is in contact with the transmission shaft and is extruded, the wedge-shaped block can slide along the matched sliding groove to compress the centering spring. Reverse elastic force generated after the centering spring is compressed can enable the fan-shaped elastic claws to evenly apply pressure to the transmission shaft, and it is guaranteed that the transmission shaft is accurately located at the center position of the clamp.

Description

Technical Field

[0001] This utility model relates to the field of clamp structure technology, specifically to a self-centering clamp for dynamic balancing of a drive shaft assembly. Background Technology

[0002] A fixture is a device used in mechanical manufacturing to fix a workpiece in the correct position for machining or inspection. The quality of fixture design directly affects production efficiency, machining costs, product quality, and production safety. Therefore, practicality, economy, and reliability must be considered when designing fixtures.

[0003] Traditional drive shaft dynamic balancing fixtures mostly employ manual centering, requiring manual adjustment of the gripper positions to achieve coaxiality calibration. Because the contact force between the gripper and the drive shaft is difficult to distribute evenly and lacks a dynamic compensation mechanism, the centering error is generally above 0.1mm, failing to meet the requirements of high-precision dynamic balancing tests (such as ISO G2.5 level). Furthermore, manual operation relies on worker experience, resulting in low efficiency; a single clamping time exceeds one minute, severely impacting production cycle time.

[0004] Existing technological attempts:

[0005] Some improved solutions employ hydraulic expansion sleeves or mechanical centering mechanisms, but these have the following drawbacks:

[0006] 1. Hydraulic systems are costly and complex to maintain;

[0007] 2. Mechanical centering mechanisms (such as four-jaw chucks) require multiple adjustments and still necessitate manual intervention;

[0008] 3. Lack of elastic compensation capability, resulting in a high risk of damage to the drive shaft surface. Utility Model Content

[0009] The purpose of this invention is to provide a self-centering fixture for dynamic balancing of drive shaft assemblies. Through a linkage structure of a fan-shaped elastic claw, a wedge block, and a centering spring, three-dimensional synchronous centering is achieved. When the drive shaft presses against the elastic claw, the wedge block slides along the groove to compress the spring. The spring's reaction force forces the elastic claw to uniformly grip the drive shaft, achieving a coaxiality error of ≤0.02mm and improving centering efficiency by over 80%. Furthermore, no manual calibration is required, thus solving the problems mentioned in the background art.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0011] A self-centering fixture for dynamic balancing of a drive shaft assembly includes a base, wherein a support assembly, a positioning assembly, and a V-shaped positioning block are provided on the upper surface of the base;

[0012] The support assembly includes a sliding block and a guide rail slidably connected to the bottom surface of the sliding block. The positioning assembly includes a fan-shaped elastic claw. A wedge block is fixedly connected to the bottom surface of the fan-shaped elastic claw by bolts. A chuck base is slidably connected to the outer wall of the wedge block. An adaptation groove for fitting the wedge block is provided on the upper surface of the chuck base. A centering spring for resetting the wedge block is provided on the inner wall of the adaptation groove. One side of the sliding block is fixedly connected to the side of the chuck base away from the fan-shaped elastic claw. A drive cylinder is fixedly connected to the side of the sliding block away from the chuck base.

[0013] A further improvement of this utility model is that the V-shaped positioning block is fixedly connected to the center of the upper surface of the base, and the number of positioning components is two sets, with the two sets of positioning components symmetrically distributed at both ends of the V-shaped positioning block.

[0014] A further improvement of the present invention is that: a side mounting block is fixedly connected to the side of the wedge block, a centering spring is fixedly connected to one end of the side mounting block, and the inner wall of the adapting groove is slidably connected to the outer wall of the wedge block.

[0015] A further improvement of this utility model is that the end of the centering spring away from the side mounting block is fixedly connected to the inner wall of the matching slide groove.

[0016] A further improvement of this utility model is that: the upper surface of the wedge block is provided with a threaded mounting hole, and the fan-shaped elastic claw is threadedly connected to the inner wall of the threaded mounting hole by a bolt passing through its bottom.

[0017] A further improvement of this utility model is that: a support mounting groove is provided on the upper surface of the base, the bottom of the inner wall of the support mounting groove is fixedly connected to the bottom surface of the guide rail, and the bottom surface of the sliding block is slidably connected to the upper surface of the base.

[0018] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0019] 1. This utility model provides a self-centering fixture for dynamic balancing of drive shaft assemblies. Through the coordinated operation of the sector-shaped elastic claws, wedge blocks, chuck base, and centering spring in the positioning assembly, automatic centering of the drive shaft is achieved. When the sector-shaped elastic claws contact the drive shaft and are compressed, the wedge blocks slide along the matching grooves, compressing the centering spring. The reverse elastic force generated by the compressed centering spring ensures that each sector-shaped elastic claw applies pressure evenly to the drive shaft, ensuring that the drive shaft is precisely centered in the fixture. This automatic centering method effectively reduces dynamic balancing test errors caused by unstable clamping or inaccurate positioning, thereby improving the accuracy of dynamic balancing tests and ensuring the quality of the drive shaft assembly.

[0020] 2. This utility model provides a self-centering fixture for dynamic balancing of drive shaft assemblies. The support component of this fixture adopts a sliding connection between a sliding block and a guide rail. A drive cylinder drives the sliding block to move along the guide rail, thereby causing the positioning components to move closer to or away from the drive shaft. Two sets of positioning components are symmetrically distributed at both ends of the V-shaped positioning block, allowing for flexible adjustment of the spacing according to the length of the drive shaft, making it suitable for drive shafts of different lengths. Furthermore, after the test is completed, the drive cylinder reverses its movement to release the workpiece. The entire operation is simple and convenient, improving work efficiency. Moreover, the V-shaped positioning block provides initial positioning for the drive shaft, further simplifying the clamping process and enhancing the fixture's adaptability and practicality. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the support component structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the positioning component structure of this utility model;

[0024] Figure 4 This is a schematic diagram of the wedge block structure of this utility model.

[0025] In the diagram: 1. Base; 2. Support assembly; 3. Positioning assembly; 4. V-shaped positioning block; 5. Sliding block; 6. Guide rail; 7. Drive cylinder; 8. Fan-shaped elastic claw; 9. Chuck base; 10. Wedge block; 11. Adaptive slide groove; 12. Side mounting block; 13. Centering spring; 14. Threaded mounting hole; 15. Support mounting groove. Detailed Implementation

[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The present invention will be further described in detail below with reference to embodiments:

[0028] Example 1

[0029] like Figure 1-4As shown, this utility model provides a self-centering fixture for dynamic balancing of a drive shaft assembly, including a base 1, and a support component 2, a positioning component 3 and a V-shaped positioning block 4 are provided on the upper surface of the base 1.

[0030] The support component 2 includes a sliding block 5 and a guide rail 6 slidably connected to the bottom surface of the sliding block 5. The positioning component 3 includes a fan-shaped elastic claw 8. A wedge block 10 is fixedly connected to the bottom surface of the fan-shaped elastic claw 8 by bolts. A chuck base 9 is slidably connected to the outer wall of the wedge block 10. An adaptation groove 11 for adapting the wedge block 10 is opened on the upper surface of the chuck base 9. A centering spring 13 for resetting the wedge block 10 is provided on the inner wall of the adaptation groove 11. One side of the sliding block 5 is fixedly connected to the side of the chuck base 9 away from the fan-shaped elastic claw 8. A drive cylinder 7 is fixedly connected to the side of the sliding block 5 away from the chuck base 9.

[0031] The V-shaped positioning block 4 is fixedly connected to the center of the upper surface of the base 1. There are two sets of positioning components 3, which are symmetrically distributed at both ends of the V-shaped positioning block 4.

[0032] Example 2

[0033] like Figure 1-4 As shown, based on Embodiment 1, this utility model provides a technical solution: preferably, a side mounting block 12 is fixedly connected to the side of the wedge block 10, and a centering spring 13 is fixedly connected to one end of the side mounting block 12, and the inner wall of the adapting groove 11 is slidably connected to the outer wall of the wedge block 10.

[0034] The end of the centering spring 13 away from the side mounting block 12 is fixedly connected to the inner wall of the fitting slide groove 11. A screw can be provided to mate with the port of the centering spring 13. The deformation of the centering spring 13 in its initial state can be adjusted by adjusting the amount of pressure exerted by the screw on the centering spring 13. The adjusting screw is threaded through the outer wall of the chuck base 9.

[0035] The upper surface of the wedge block 10 is provided with a threaded mounting hole 14, and the fan-shaped elastic claw 8 is threadedly connected to the inner wall of the threaded mounting hole 14 by a bolt that passes through its bottom.

[0036] The upper surface of the base 1 is provided with a support mounting groove 15. The bottom of the inner wall of the support mounting groove 15 is fixedly connected to the bottom surface of the guide rail 6, and the bottom surface of the sliding block 5 is slidably connected to the upper surface of the base 1.

[0037] The working principle of the self-centering fixture used for dynamic balancing of the drive shaft assembly will be explained in detail below.

[0038] like Figure 1-4 As shown, I. Initial Preparation

[0039] Before starting work, the fixture is in its initial state, with the two sets of positioning components 3 located relatively far apart, the centering spring 13 in its naturally extended state, and the fan-shaped elastic claw 8 in its open state. At this time, the drive shaft to be dynamically balanced can be placed into the fixture.

[0040] II. Placement of the drive shaft

[0041] The drive shaft is placed on the V-shaped positioning block 4 on the base 1. The V-shaped positioning block 4 is fixed at the center of the upper surface of the base 1. It can play a preliminary positioning role for the drive shaft, ensuring that the drive shaft is roughly in the center of the fixture.

[0042] III. The driving positioning component approaches

[0043] When the drive cylinder 7 is activated, it pushes the sliding block 5 along the guide rail 6, which is slidably connected to the bottom surface of the sliding block 5 and installed in the support mounting groove 15 on the upper surface of the base 1. Since the sliding block 5 is also fixedly connected to the chuck base 9, the chuck base 9 moves closer to the drive shaft along with the sliding block 5.

[0044] IV. Centering and Clamping Process

[0045] As the chuck base 9 approaches the drive shaft, the sector-shaped elastic claw 8 gradually contacts both ends of the drive shaft. Since the bottom surface of the sector-shaped elastic claw 8 is fixedly connected to the wedge block 10 by bolts, the wedge block 10 is slidably connected to the adapter groove 11 on the chuck base 9, and a centering spring 13 is provided in the adapter groove 11, when the sector-shaped elastic claw 8 is squeezed by the drive shaft, the wedge block 10 will slide inward along the adapter groove 11, while compressing the centering spring 13.

[0046] When the centering spring 13 is compressed, it generates a reverse elastic force. This elastic force causes each sector-shaped elastic claw 8 to apply pressure evenly to the drive shaft, thereby achieving the function of automatic centering. Because there are two sets of positioning components 3 symmetrically distributed at both ends of the V-shaped positioning block 4, both ends of the drive shaft will be stably clamped simultaneously.

[0047] V. Dynamic Balancing Test

[0048] Once the drive shaft is stably clamped and automatically centered, the dynamic balancing test of the drive shaft assembly can be performed. During the test, the fixture ensures the stability of the drive shaft, reducing test errors caused by unstable clamping.

[0049] 6. Loosen the workpiece

[0050] After the dynamic balancing test is completed, the drive cylinder 7 reverses its action, pulling the sliding block 5 along the guide rail 6 away from the drive shaft. At this time, the centering spring 13 releases its elastic potential energy, pushing the wedge block 10 to slide outward along the matching groove 11, causing the fan-shaped elastic claw 8 to open, thereby releasing the workpiece and making it easier to remove the tested drive shaft from the fixture.

[0051] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A self-centering fixture for dynamic balancing of a propeller shaft assembly comprising a base (1), characterized in that: The upper surface of the base (1) is provided with a support assembly (2), a positioning assembly (3) and a V-shaped positioning block (4); The support assembly (2) comprises a sliding block (5) and a guide rail (6) slidably connected to the bottom surface of the sliding block (5), the positioning assembly (3) comprises a fan-shaped elastic claw (8), the bottom surface of the fan-shaped elastic claw (8) is fixedly connected with a wedge-shaped block (10) through a bolt, the outer wall of the wedge-shaped block (10) is slidably connected with a chuck base (9), the upper surface of the chuck base (9) is provided with an adaptive sliding groove (11) for adapting the wedge-shaped block (10), the inner wall of the adaptive sliding groove (11) is provided with a centering spring (13) for resetting the wedge-shaped block (10), one side of the sliding block (5) is fixedly connected with the side of the chuck base (9) away from the fan-shaped elastic claw (8), and the side of the sliding block (5) away from the chuck base (9) is fixedly connected with a driving air cylinder (7).

2. A self-centering fixture for dynamic balancing of a propeller shaft assembly as defined in claim 1 wherein: The V-shaped positioning block (4) is fixedly connected to the center of the upper surface of the base (1), and the number of the positioning assembly (3) is two groups, and the two groups of positioning assemblies (3) are symmetrically distributed at both ends of the V-shaped positioning block (4).

3. A self-centering fixture for dynamic balancing of a propeller shaft assembly as defined in claim 1 wherein: The side surface of the wedge-shaped block (10) is fixedly connected with a side position mounting block (12), one end of the side position mounting block (12) is fixedly connected with a centering spring (13), and the inner wall of the adaptive sliding groove (11) is slidably connected with the outer wall of the wedge-shaped block (10).

4. A self-centering fixture for dynamic balancing of a propeller shaft assembly as defined in claim 3 wherein: The end of the centering spring (13) away from the side position mounting block (12) is fixedly connected with the inner wall of the adaptive sliding groove (11).

5. A self-centering fixture for dynamic balancing of a propeller shaft assembly as defined in claim 1 wherein: The upper surface of the wedge-shaped block (10) is provided with a threaded mounting hole (14), and the fan-shaped elastic claw (8) is threadedly connected with the inner wall of the threaded mounting hole (14) through the bolt penetrating the bottom thereof.

6. A self-centering fixture for dynamic balancing of a propeller shaft assembly as defined in claim 1 wherein: The upper surface of the base (1) is provided with a support mounting groove (15), the inner wall bottom of the support mounting groove (15) is fixedly connected with the bottom surface of the guide rail (6), and the bottom surface of the sliding block (5) is slidably connected with the upper surface of the base (1).

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